> On a bright day 30 sec will call for iso 2 film or slower or a 20 stop
> ND filter. The lock I want is for exposure of 15 min to 1 hour.
I once did a 3-sec with 400 ASA film, ND4 and a lens stopped down to f/32... Hoya
makes a ND [insert large number here] filter (don't remember the exact number), and it
should allow LOOOONG exposures...
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